Numerical investigation for performance of non-axisymmetric front variable area bypasses injector

The concept of non-axisymmetric forward variable area bypass injector (FVABI) was proposed based on the structure of axisymmetric FVABI. To compare the thermal mixing efficiency, ejector coefficient, total pressure recovery coefficient of non-axisymmetric FVABI with axisymmetric FVABI, a series of numerical simulation were conducted based on the non-axisymmetric and axisymmetric FVABI with variation of the mixing angle, inlet to exit pressure ratio and the principle of effects on the performance was obtained. The results show that the thermal mixing efficiency, total pressure recovery coefficient and ejector coefficient of FVABI decrease with the increasing mixing angle when the exit flow area of first bypass is constant. In subcritical condition, there is a decrease in ejector coefficient and an increase in both of thermal mixing efficiency and total pressure recovery coefficient when the inlet to exit pressure ratio increases. The thermal mixing efficiency of non-axisymmetric FVABI is higher than that of axisymmetric FVABI under the same conditions. The total pressure recovery coefficient of non-axisymmetric FVABI decreases by 2%, while ejector coefficient reduces 20% as compared with axisymmetric FVABI.